docstr: Previously we had a bug where an empty document list would cause a crash 
docstr_tok: ["Previously","we","had","a","bug","where","an","empty","document","list","would","cause","a","crash"]
code: def test_empty_bulk_process(self, pipeline):
      """Previously we had a bug where an empty document list would cause a crash"""
      processed = pipeline.bulk_process([])
      assert processed == []
  
imports: import pytest
  import stanza
  from stanza.utils.conll import CoNLL
  from stanza.models.common.doc import Document
  from stanza.tests import *
  from stanza.tests.pipeline.pipeline_device_tests import check_on_gpu, check_on_cpu
label_desc: Use image node_id 10 for calling the TestEnglishPipeline obj's underlying member method code with example usage: obj.test_empty_bulk_process(pipeline) without return types